Disclosure Of Fair Value Measurement [Text Block]
| Concept |
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As at 2020-12-31 |
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As at 2020-01-01 |
As at 2019-12-31 |
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| Disclosure of fair value measurement [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of fair value measurement of assets [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of fair value measurement of assets [abstract] | ||||||||||||||||||||||||||||||||||||
| Disclosure of fair value measurement of assets [line items] | ||||||||||||||||||||||||||||||||||||
| Assets | — | — | — | — | — | — |
5,450,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
4,6 3 9
GBP
|
3 ,9 5 4
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Reconciliation of changes in fair value measurement, assets [abstract] | ||||||||||||||||||||||||||||||||||||
| Disclosure of fair value measurement of liabilities [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of fair value measurement of liabilities [abstract] | ||||||||||||||||||||||||||||||||||||
| Disclosure of fair value measurement of liabilities [line items] | ||||||||||||||||||||||||||||||||||||
| Liabilities | — | — | — | — | — | — |
3,472,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
2, 941
GBP
|
2,224,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Reconciliation of changes in fair value measurement, liabilities [abstract] | ||||||||||||||||||||||||||||||||||||
| Disclosure of fair value measurement of equity [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of fair value measurement of equity [abstract] | ||||||||||||||||||||||||||||||||||||
| Disclosure of fair value measurement of equity [line items] | ||||||||||||||||||||||||||||||||||||
| Equity |
2 6
GBP
|
2 , 76 9
GBP
|
5,000,000
GBP
|
94 6
GBP
|
–
GBP
|
38,000,000
GBP
|
1,9 7 8
GBP
|
–
GBP
|
1 ,9 6 1
GBP
|
17,000,000
GBP
|
–
GBP
|
197,000,000
GBP
|
–
GBP
|
41,000,000
GBP
|
1 , 182
GBP
|
1,3 8 3
GBP
|
4,000,000
GBP
|
19,000,000
GBP
|
1,67 9
GBP
|
141,000,000
GBP
|
1, 3 8 4
GBP
|
27,000,000
GBP
|
17,000,000
GBP
|
1,6 9 8
GBP
|
1 , 730
GBP
|
18,000,000
GBP
|
17,000,000
GBP
|
1, 3 8 4
GBP
|
1 , 730
GBP
|
1 ,375
GBP
|
1 , 182
GBP
|
12,000,000
GBP
|
16,000,000
GBP
|
141,000,000
GBP
|
5,000,000
GBP
|
1,7 1 2
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |